Allocate space for the group array in a static credential used in the quota code.  One case was correctly handled in r194498, but this one was missed.
Allocate space for the group array in a static credential used in
the quota code.  One case was correctly handled in r194498, but
this one was missed.

PR:		kern/138657
Tested by:	PR submitter
MFC after:	3 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase